`let x=1` and `const x=1` don't work.

[ahuigo]

package m

import (
	"fmt"
	"testing"

	"github.com/robertkrimen/otto"
)

func TestEvalJs(t *testing.T) {
	vm := otto.New()
	vm.Set("body", `{"page":1}`)
	v, err := vm.Run(`
        let abc = 2 + 2;// Not work here
        console.log("The value of abc is " + abc); // 4
    `)
	if err != nil {
		fmt.Printf("%+v, val:%v", err, v)
	}
}

I find another lib which supports const/let: https://github.com/dop251/goja

[chrislowth]

Otto is an implementation of ECMA standard version ES5. "let" and "const" are not part of that standard. They were introduced in ES6. You should use "var" instead.

…

On Fri, 22 Dec 2023, 04:09 Ahuigo, ***@***.***> wrote: package m import ( "fmt" "testing" "github.com/robertkrimen/otto" ) func TestEvalJs(t *testing.T) { vm := otto.New() vm.Set("body", `{"page":1}`) v, err := vm.Run(` let abc = 2 + 2;// Not work here console.log("The value of abc is " + abc); // 4 `) if err != nil { fmt.Printf("%+v, val:%v", err, v) } } — Reply to this email directly, view it on GitHub <#515>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AH2YHJJGJ6NK4IYEGGVF72LYKUBVRAVCNFSM6AAAAABA7JR6E6VHI2DSMVQWIX3LMV43ASLTON2WKOZSGA2TGMZVGI4TSMY> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[Asday]

Please note that this is in the README also.

[stevenh]

PRs to introduce newer features are welcome, would be nice if we could get to ES6 in the future.

[gw123]

ES6